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【简答题】
无符号整数和带符号整数加、减运算可以用同一个加法器及辅助电路实现,如图,图中∑是二进制加法器,实现的加法运算为F=A+B+C0。 当M=0时,F=________________,进行__________(加法/减法)运算;当M=1时,F=________________,进行__________(加法/减法)运算。
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